Stacy made his first career start for the St. Louis Rams last week and rushed for 78 yards on 14 carries before leaving with a rib injury. He gets another shot this week against the Houston Texans in a matchup that presents more opportunities on the ground than through the air.

Stacy is the biggest back on the Rams' roster and is being trusted by coach Jeff Fisher to bring a spark to a stagnant running game. His size and power running style also make Stacy the likely choice in goal-line situations.

Ellington's skill set is different, with less power and more explosion. He's a smaller back -- he stands at just 5-9 -- and is the shifty, home run hitter to complement bruising Rashard Mendenhall for the Arizona Cardinals.

Ellington rolled up 83 total yards, including a career-high 52 rushing yards on seven carries, in a Week 5 win over the Carolina Panthers. He played the same number of snaps as Mendenhall and could continue to get increased attention. At the very least, Ellington is a nice contributor in PPR leagues with 10 catches in his last three games.

The common theme for both Stacy and Ellington is upside. As unproven rookies, they have opportunities to shine for their respective teams, and to give fantasy owners a shot at catching lightning in a bottle.

Ellington and Stacy both have higher ceilings than, say, New Orleans Saints veteran Pierre Thomas. All three are worth looks on the waiver wire this week.